14484Sbinkertn@umich.edu/*- 24484Sbinkertn@umich.edu * Copyright (c) 2006 Joseph Koshy 34484Sbinkertn@umich.edu * All rights reserved. 44484Sbinkertn@umich.edu * 54484Sbinkertn@umich.edu * Redistribution and use in source and binary forms, with or without 64484Sbinkertn@umich.edu * modification, are permitted provided that the following conditions 74484Sbinkertn@umich.edu * are met: 84484Sbinkertn@umich.edu * 1. Redistributions of source code must retain the above copyright 94484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer. 104484Sbinkertn@umich.edu * 2. Redistributions in binary form must reproduce the above copyright 114484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer in the 124484Sbinkertn@umich.edu * documentation and/or other materials provided with the distribution. 134484Sbinkertn@umich.edu * 144484Sbinkertn@umich.edu * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 154484Sbinkertn@umich.edu * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 164484Sbinkertn@umich.edu * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 174484Sbinkertn@umich.edu * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 184484Sbinkertn@umich.edu * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 194484Sbinkertn@umich.edu * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 204484Sbinkertn@umich.edu * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 214484Sbinkertn@umich.edu * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 224484Sbinkertn@umich.edu * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 234484Sbinkertn@umich.edu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 244484Sbinkertn@umich.edu * SUCH DAMAGE. 254484Sbinkertn@umich.edu */ 264484Sbinkertn@umich.edu 274484Sbinkertn@umich.edu 284484Sbinkertn@umich.edu#include <assert.h> 294484Sbinkertn@umich.edu#include <errno.h> 304484Sbinkertn@umich.edu#include "libelf.h" 314484Sbinkertn@umich.edu#include <stdlib.h> 324484Sbinkertn@umich.edu 334484Sbinkertn@umich.edu#include "_libelf.h" 344484Sbinkertn@umich.edu 354484Sbinkertn@umich.edu 364484Sbinkertn@umich.eduElf_Data * 374484Sbinkertn@umich.eduelf_getdata(Elf_Scn *s, Elf_Data *d) 384484Sbinkertn@umich.edu{ 394484Sbinkertn@umich.edu Elf *e; 404484Sbinkertn@umich.edu char *dst; 414484Sbinkertn@umich.edu size_t fsz, msz, count; 424484Sbinkertn@umich.edu int elfclass, elftype; 434484Sbinkertn@umich.edu unsigned int sh_type; 444484Sbinkertn@umich.edu uint64_t sh_align, sh_offset, sh_size; 454484Sbinkertn@umich.edu void (*xlate)(char *_d, char *_s, size_t _c, int _swap); 464484Sbinkertn@umich.edu 474484Sbinkertn@umich.edu if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF || 484484Sbinkertn@umich.edu (d != NULL && s != d->d_scn)) { 494484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 504484Sbinkertn@umich.edu return (NULL); 514484Sbinkertn@umich.edu } 524484Sbinkertn@umich.edu 534484Sbinkertn@umich.edu if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL) 544484Sbinkertn@umich.edu return (d); 554484Sbinkertn@umich.edu 564484Sbinkertn@umich.edu if (d != NULL) 574484Sbinkertn@umich.edu return (STAILQ_NEXT(d, d_next)); 584484Sbinkertn@umich.edu 594484Sbinkertn@umich.edu if (e->e_rawfile == NULL) { 604484Sbinkertn@umich.edu LIBELF_SET_ERROR(SEQUENCE, 0); 614484Sbinkertn@umich.edu return (NULL); 624484Sbinkertn@umich.edu } 634484Sbinkertn@umich.edu 644484Sbinkertn@umich.edu elfclass = e->e_class; 654484Sbinkertn@umich.edu 664484Sbinkertn@umich.edu assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64); 674484Sbinkertn@umich.edu 684484Sbinkertn@umich.edu if (elfclass == ELFCLASS32) { 694484Sbinkertn@umich.edu sh_type = s->s_shdr.s_shdr32.sh_type; 704484Sbinkertn@umich.edu sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; 714484Sbinkertn@umich.edu sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; 724484Sbinkertn@umich.edu sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; 734484Sbinkertn@umich.edu } else { 744484Sbinkertn@umich.edu sh_type = s->s_shdr.s_shdr64.sh_type; 754484Sbinkertn@umich.edu sh_offset = s->s_shdr.s_shdr64.sh_offset; 764484Sbinkertn@umich.edu sh_size = s->s_shdr.s_shdr64.sh_size; 774484Sbinkertn@umich.edu sh_align = s->s_shdr.s_shdr64.sh_addralign; 784484Sbinkertn@umich.edu } 794484Sbinkertn@umich.edu 804484Sbinkertn@umich.edu if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST || 814484Sbinkertn@umich.edu elftype > ELF_T_LAST || 824484Sbinkertn@umich.edu sh_offset + sh_size > (uint64_t) e->e_rawsize) { 834484Sbinkertn@umich.edu LIBELF_SET_ERROR(SECTION, 0); 844484Sbinkertn@umich.edu return (NULL); 854484Sbinkertn@umich.edu } 864484Sbinkertn@umich.edu 874484Sbinkertn@umich.edu if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(elftype, 884484Sbinkertn@umich.edu (size_t) 1, e->e_version)) == 0) { 894484Sbinkertn@umich.edu LIBELF_SET_ERROR(UNIMPL, 0); 904484Sbinkertn@umich.edu return (NULL); 914484Sbinkertn@umich.edu } 924484Sbinkertn@umich.edu 934484Sbinkertn@umich.edu 944484Sbinkertn@umich.edu if (sh_size % fsz) { 954484Sbinkertn@umich.edu LIBELF_SET_ERROR(SECTION, 0); 964484Sbinkertn@umich.edu return (NULL); 974484Sbinkertn@umich.edu } 984484Sbinkertn@umich.edu 994484Sbinkertn@umich.edu count = sh_size / fsz; 1004484Sbinkertn@umich.edu 1014484Sbinkertn@umich.edu msz = _libelf_msize(elftype, elfclass, e->e_version); 1024484Sbinkertn@umich.edu 1034484Sbinkertn@umich.edu assert(msz > 0); 1044484Sbinkertn@umich.edu 1054484Sbinkertn@umich.edu if ((dst = malloc(msz*count)) == NULL) { 1064484Sbinkertn@umich.edu LIBELF_SET_ERROR(RESOURCE, 0); 1074484Sbinkertn@umich.edu return (NULL); 1084484Sbinkertn@umich.edu } 1094484Sbinkertn@umich.edu 1104484Sbinkertn@umich.edu if ((d = _libelf_allocate_data(s)) == NULL) 1114484Sbinkertn@umich.edu return (NULL); 1124484Sbinkertn@umich.edu 1134484Sbinkertn@umich.edu d->d_buf = dst; 1144484Sbinkertn@umich.edu d->d_off = 0; 1154484Sbinkertn@umich.edu d->d_align = sh_align; 1164484Sbinkertn@umich.edu d->d_size = msz * count; 1174484Sbinkertn@umich.edu d->d_type = elftype; 1184484Sbinkertn@umich.edu d->d_version = e->e_version; 1194484Sbinkertn@umich.edu 1204484Sbinkertn@umich.edu d->d_flags |= LIBELF_F_MALLOCED; 1214484Sbinkertn@umich.edu STAILQ_INSERT_TAIL(&s->s_data, d, d_next); 1224484Sbinkertn@umich.edu 1234484Sbinkertn@umich.edu xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass); 1244484Sbinkertn@umich.edu (*xlate)(d->d_buf, e->e_rawfile + sh_offset, count, e->e_byteorder != 1254484Sbinkertn@umich.edu LIBELF_PRIVATE(byteorder)); 1264484Sbinkertn@umich.edu 1274484Sbinkertn@umich.edu return (d); 1284484Sbinkertn@umich.edu} 1294484Sbinkertn@umich.edu 1304484Sbinkertn@umich.eduElf_Data * 1314484Sbinkertn@umich.eduelf_newdata(Elf_Scn *s) 1324484Sbinkertn@umich.edu{ 1334484Sbinkertn@umich.edu Elf *e; 1344484Sbinkertn@umich.edu Elf_Data *d; 1354484Sbinkertn@umich.edu 1364484Sbinkertn@umich.edu if (s == NULL || (e = s->s_elf) == NULL || 1374484Sbinkertn@umich.edu e->e_kind != ELF_K_ELF) { 1384484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1394484Sbinkertn@umich.edu return (NULL); 1404484Sbinkertn@umich.edu } 1414484Sbinkertn@umich.edu 1424484Sbinkertn@umich.edu /* 1434484Sbinkertn@umich.edu * elf_newdata() has to append a data descriptor, so 1444484Sbinkertn@umich.edu * bring in existing section data if not already present. 1454484Sbinkertn@umich.edu */ 1464484Sbinkertn@umich.edu if (e->e_rawfile && s->s_size > 0 && STAILQ_EMPTY(&s->s_data)) 1474484Sbinkertn@umich.edu if (elf_getdata(s, NULL) == NULL) 1484484Sbinkertn@umich.edu return (NULL); 1494484Sbinkertn@umich.edu 1504484Sbinkertn@umich.edu if ((d = malloc(sizeof(Elf_Data))) == NULL) { 1514484Sbinkertn@umich.edu LIBELF_SET_ERROR(RESOURCE, errno); 1524484Sbinkertn@umich.edu return (NULL); 1534484Sbinkertn@umich.edu } 1544484Sbinkertn@umich.edu 1554484Sbinkertn@umich.edu STAILQ_INSERT_TAIL(&s->s_data, d, d_next); 1564484Sbinkertn@umich.edu d->d_flags = 0; 1574484Sbinkertn@umich.edu d->d_scn = s; 1584484Sbinkertn@umich.edu 1594484Sbinkertn@umich.edu d->d_align = 1; 1604484Sbinkertn@umich.edu d->d_buf = NULL; 1614484Sbinkertn@umich.edu d->d_off = (uint64_t) ~0; 1624484Sbinkertn@umich.edu d->d_size = 0; 1634484Sbinkertn@umich.edu d->d_type = ELF_T_BYTE; 1644484Sbinkertn@umich.edu d->d_version = LIBELF_PRIVATE(version); 1654484Sbinkertn@umich.edu 1664484Sbinkertn@umich.edu (void) elf_flagscn(s, ELF_C_SET, ELF_F_DIRTY); 1674484Sbinkertn@umich.edu 1684484Sbinkertn@umich.edu return (d); 1694484Sbinkertn@umich.edu} 1704484Sbinkertn@umich.edu 1714484Sbinkertn@umich.edu/* 1724484Sbinkertn@umich.edu * Retrieve a data descriptor for raw (untranslated) data for section 1734484Sbinkertn@umich.edu * `s'. 1744484Sbinkertn@umich.edu */ 1754484Sbinkertn@umich.edu 1764484Sbinkertn@umich.eduElf_Data * 1774484Sbinkertn@umich.eduelf_rawdata(Elf_Scn *s, Elf_Data *d) 1784484Sbinkertn@umich.edu{ 1794484Sbinkertn@umich.edu Elf *e; 1804484Sbinkertn@umich.edu int elf_class; 1814484Sbinkertn@umich.edu uint64_t sh_align, sh_offset, sh_size; 1824484Sbinkertn@umich.edu 1834484Sbinkertn@umich.edu if (s == NULL || (e = s->s_elf) == NULL || 1844484Sbinkertn@umich.edu e->e_kind != ELF_K_ELF || e->e_rawfile == NULL) { 1854484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1864484Sbinkertn@umich.edu return (NULL); 1874484Sbinkertn@umich.edu } 1884484Sbinkertn@umich.edu 1894484Sbinkertn@umich.edu if (d == NULL && (d = STAILQ_FIRST(&s->s_rawdata)) != NULL) 1904484Sbinkertn@umich.edu return (d); 1914484Sbinkertn@umich.edu 1924484Sbinkertn@umich.edu if (d != NULL) 1934484Sbinkertn@umich.edu return (STAILQ_NEXT(d, d_next)); 1944484Sbinkertn@umich.edu 1954484Sbinkertn@umich.edu elf_class = e->e_class; 1964484Sbinkertn@umich.edu 1974484Sbinkertn@umich.edu assert(elf_class == ELFCLASS32 || elf_class == ELFCLASS64); 1984484Sbinkertn@umich.edu 1994484Sbinkertn@umich.edu if (elf_class == ELFCLASS32) { 2004484Sbinkertn@umich.edu sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; 2014484Sbinkertn@umich.edu sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; 2024484Sbinkertn@umich.edu sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; 2034484Sbinkertn@umich.edu } else { 2044484Sbinkertn@umich.edu sh_offset = s->s_shdr.s_shdr64.sh_offset; 2054484Sbinkertn@umich.edu sh_size = s->s_shdr.s_shdr64.sh_size; 2064484Sbinkertn@umich.edu sh_align = s->s_shdr.s_shdr64.sh_addralign; 2074484Sbinkertn@umich.edu } 2084484Sbinkertn@umich.edu 2094484Sbinkertn@umich.edu if ((d = _libelf_allocate_data(s)) == NULL) 2104484Sbinkertn@umich.edu return (NULL); 2114484Sbinkertn@umich.edu 2124484Sbinkertn@umich.edu d->d_buf = e->e_rawfile + sh_offset; 2134484Sbinkertn@umich.edu d->d_off = 0; 2144484Sbinkertn@umich.edu d->d_align = sh_align; 2154484Sbinkertn@umich.edu d->d_size = sh_size; 2164484Sbinkertn@umich.edu d->d_type = ELF_T_BYTE; 2174484Sbinkertn@umich.edu d->d_version = e->e_version; 2184484Sbinkertn@umich.edu 2194484Sbinkertn@umich.edu STAILQ_INSERT_TAIL(&s->s_rawdata, d, d_next); 2204484Sbinkertn@umich.edu 2214484Sbinkertn@umich.edu return (d); 2224484Sbinkertn@umich.edu} 223